Create tag 5.2.0

Merge remote-tracking branch 'osgeo/master'

bump man3 version numbers

Update release date

Merge pull request OSGeo#405 from kbevers/selftest-compile-flag

Changed self-test build behaviour from opt-out to opt-in

increment soversion to 10:0:1 for RC3

update libtool to a generic linux i386 version

git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@2648 4e78687f-474d-0410-85f9-8d5e500ac6b2

Tag for 4.9.0

Prepare for the 4.8.0 release.

4.7.0 release prep.