Added end date to --tsv view.

Minor change, but forked the project as it would mess other peoples TSV
outputs. Don't know if that bothers anyone, but hey.
Updated --tsv output docs.
option to print event description in agenda

Added 'agenda-description' boolean config file option. Also added '-d' option
for the agenda command. Command line switch overrides the config file setting if
specified. If '--details' option is specified then the description is printed
with the details 'content' section as before.
increase indent with usage help string

agenda command help needs more room.
Merge remote-tracking branch 'birdslikewires/master'
Merge remote-tracking branch 'wor/master'

Wrap description at column 80 where possible