Change install prefix.
Revert "Change install prefix."

This reverts commit 2bbd34eea724fd007f2e382ac952cebe01e67251.
Add BuildRequires for scons in the spec file.
Link against libtiff in a version-agnostic way.
pkg-config output for shapelib isn't available on RHEL6, so do it the old-fashioned way.
Link to libpng in a version-agnostic way.
Add missing include path for libasf_vector.
Add missing include dir in asf_kml_overlay.
Merge pull request #234 from asfadmin/jsn

Update mapready scons build to work on RHEL6.