Help for reporting options is now also defined once in lib.m4
(in addition to CliOptions.hs). Also fixed some duplication of general
options in docs. hledger-* manuals now include the full list of general
and reporting options; we assume that any inapplicable options get
harmlessly ignored and that this will not surprise users.
use simpler markup
use pre blocks more consistently
pandoc table experiments
no more right-floating examples, use columns if needed
doc edits
style tweaks
