Merge pull request #167 from khogenso/devel

MANY compiler warning fixes
Have to disable libasf_proj unit testing for now, breaks the build
Turning off the unit tests in libasf_geocode for now - circular deps.
Merge branch 'devel' of github.com:asfadmin/ASF_MapReady into devel
New option "-grid-match" to asf_terrcorr that uses tiles to match

This is code we had in there but was disabled.  Now that functionality
is available from the command-line to asf_terrcorr.  It will exit after
generating the matching grid, users will then have to use fit_warp etc
in order to complete terrain correction.  Added help info about it.