;doc: update CLI help text files

hledger/Hledger/Cli/Commands/Balance.txt

@@ -606,6 +606,18 @@ Budget performance in 2017/11/01-2017/12/31:
 ----------------------++----------------------------------------------------
                       ||      0 [              0]       0 [              0] 
 
+It's common to limit budgets/budget reports to just expenses
+
+hledger bal -M --budget expenses
+
+or just revenues and expenses (eg, using account types):
+
+hledger bal -M --budget type:rx
+
+It's also common to limit or convert them to a single currency (cur:COMM
+or -X COMM [--infer-market-prices]). If showing multiple currencies,
+--layout bare or --layout tall can help.
+
 For more examples and notes, see Budgeting.
 
 Budget report start date
@@ -737,8 +749,8 @@ Selecting budget goals
 
 The budget report evaluates periodic transaction rules to generate
 special "goal transactions", which generate the goal amounts for each
-account in each report subperiod. When troubleshooting, you can use the
+account in each report subperiod. When troubleshooting, you can use
-print command to show these as forecasted transactions:
+print --forecast to show these as forecasted transactions:
 
 $ hledger print --forecast=BUDGETREPORTPERIOD tag:generated
 
@@ -755,6 +767,47 @@ regular expression or query). This means you can give your periodic
 rules descriptions (remember that two spaces are needed), and then
 select from multiple budgets defined in your journal.
 
+Budget vs forecast
+
+hledger --forecast ... and hledger balance --budget ... are separate
+features, though both of them use the periodic transaction rules defined
+in the journal, and both of them generate temporary transactions for
+reporting purposes ("forecast transactions" and "budget goal
+transactions", respectively). You can use both features at the same time
+if you want. Here are some differences between them, as of hledger 1.29:
+
+CLI:
+
+-   --forecast is a general hledger option, usable with any command
+-   --budget is a balance command option, usable only with that command.
+
+Visibility of generated transactions:
+
+-   forecast transactions are visible in any report, like ordinary
+    transactions
+-   budget goal transactions are invisible except for the goal amounts
+    they produce in --budget reports.
+
+Periodic transaction rules:
+
+-   --forecast uses all available periodic transaction rules
+-   --budget uses all periodic rules (--budget) or a selected subset
+    (--budget=DESCPAT)
+
+Period of generated transactions:
+
+-   --forecast generates forecast transactions
+    -   from after the last regular transaction to the end of the report
+        period (--forecast)
+    -   or, during a specified period (--forecast=PERIODEXPR)
+    -   possibly further restricted by a period specified in the
+        periodic transaction rule
+    -   and always restricted within the bounds of the report period
+-   --budget generates budget goal transactions
+    -   throughout the report period
+    -   possibly restricted by a period specified in the periodic
+        transaction rule.
+
 Data layout
 
 The --layout option affects how balance reports show multi-commodity

hledger/Hledger/Cli/Commands/Check.txt

@@ -62,6 +62,8 @@ therefore optional:
 -   recentassertions - all accounts with balance assertions have a
     balance assertion no more than 7 days before their latest posting
 
+-   tags - all tags used by transactions have been declared
+
 -   uniqueleafnames - all account leaf names are unique
 
 Custom checks

hledger/Hledger/Cli/Commands/Import.txt

@@ -75,6 +75,13 @@ or (live updating):
 
 $ ls bank.csv* | entr bash -c 'echo ====; hledger import --dry bank.csv | hledger -f- -I print unknown'
 
+Note: when importing from multiple files at once, it's currently
+possible for some .latest files to be updated successfully, while the
+actual import fails because of a problem in one of the files, leaving
+them out of sync (and causing some transactions to be missed). To
+prevent this, do a --dry-run first and fix any problems before the real
+import.
+
 Importing balance assignments
 
 Entries added by import will have their posting amounts made explicit