fix sanity check for matplotlib v1.3.x
add missing libpng dep for freetype v2.5.0.1
fix typo in SCons easyconfigs
add alternatives for checking lxml egg in sanity check paths
specify alternatives for matplotlib sanity check
fix sanity check for motif
add alternatives to sanity check for pandas
Merge branch 'develop' into fix_bugs
fix typo
add Szip as dependency for Ferret, required because of linking to HDF5 lib
Merge pull request #537 from boegel/fix_bugs

fix bugs in various easyconfig files