Use argparse in obspy-flinn-engdahl.

Also fix a couple typos here.
Use argparse in obspy-print.
Use argparse in obspy-plot.
Use argparse in obspy-mseed-recordanalyzer.
Use argparse in xseed scripts.
Use argparse in obspy-indexer.

I also added a few short/long name versions of options.
Use argparse for obspy-reftekrescue.
Merge branch 'master' into argparse
Re-register Flinn-Engdahl script.
Changelog for current script changes.
Fix typo in xseed scripts.
Use argparse in obspy-scan.
Use argparse in obspy-runtests.
Conditional dependency on argparse.
Use argparse in obspy-mopad.

I tested this in general, but not every single option. Note, the gmt
subcommand was broken originally.
Restore deprecated script options, with a warning.

They will produce a UserWarning, but otherwise should work as they did
previously.
Merge branch 'krischer/argparse' into argparse
Setup --format choices using ENTRY_POINTS.

This enabled argparse to print the valid choice in the --help string. It
also then tests that the user picked a valid choice.
Fix tests for obspy-scan.

I didn't realize there was a test for this!
argparse dependency for deb packages with py<2.7

should probably work also without the "|" operator as at least wheezy
seems to contain a dummy package for python-argparse provided by
python2.7 itself. Seems safer this way though, no idea when/if these
virtual packages will be dropped.