dates: Fix bare times to be relative to "today"

dates: improve timezone handling datestr: - add format specifiers %1 and %2 for timezone hours and minutes - remove timezone and timezone format options - correctly find timezone hours and minutes for fractional and negative timezones - update users strdate: - correctly find timezone hours and minutes for fractional and negative timezones

revlog: report node and file when lookup fails

Merge with crew

fetch: don't proceed if working directory is missing files (issue988)

fetch: rename --force-editor option to --edit, for consistency

dates: fix fractional timezone display rounding bug