Renamed: writeValidJournal -> writeJournalTextIfValidAndChanged
Added comments clarifying line ending behaviour of:
add, import, appendToJournalFileOrStdout, readFilePortably,
writeFileWithBackupIfChanged, writeJournalTextIfValidAndChanged
Summary of current behaviour:
- hledger add and import commands will append with (at least some)
unix line endings, possibly causing the file to have mixed line
endings
- hledger-web edit and upload forms will write the file with
the current system's native line endings, ie changing all
line endings if the file previously used foreign line endings.
It seems like show (toJSON "a") used to give "\"a\"" instead of
"String \"a\"". I haven't found the root cause, it's possible
that this fix won't work if built with older libs.
