Rename asf_convert_gui to mapready and asf_convert to asf_mapready.
More renamings for mapready and asf_mapready.
Get rid of unnecessary references to the scons global environment.

Also update SConscripts for mapready and asf_mapready to reflect the renaming.
Restore missing gmodule-export-2.0 link flags that broke mapready at runtime.
Merge branch 'devel' of https://github.com/asfadmin/ASF_MapReady into devel
Add missing gexport linker options to asf_view.
Add missing gexport linker options to metadata_gui.
Add missing gexport linker options to proj2proj.
Merge pull request #186 from asfadmin/jsn

Rename asf_convert_gui to mapready and asf_convert to asf_mapready.