fn tests: add very basic pocount -h test
fn tests: enable testing on Travis
fn tests: pocount of single po file
fn tests: very early README

This should go into the docs proper once it stops churning.
fn tests: pofilter listfilters
fn test: pofilter --manpage
fn tests: prop2po simple file conversion
fn tests: prop2po processing directories
optrecurse: order the format types string

Otherwise its hard to test the list as the order always changes.
argparse: ensure argparse for 2.6

argoarse is included in 2.7, so we only need this for 2.6.  On 2.7 the
system should already be supplying this, on 2.6 it will most likely be
installed or upgraded.
Try not use bash but the command itself
fn tests: Create shared functions library

Move podiff into that
Create tdiff which does any special format specific diff handling
fn tests: make sure we fail if a subtest fails