Re #1742 (misc): Fixed incorrect checking of require_100rel configuration



git-svn-id: http://svn.pjsip.org/repos/pjproject@4779 74dad513-b988-da41-8d7b-12977e46ad98
Re #1742 (misc): Fixed doc for Call::reinvite() in pjsua2 lib



git-svn-id: http://svn.pjsip.org/repos/pjproject@4780 74dad513-b988-da41-8d7b-12977e46ad98
Re #1742 (misc): Add pjsua2 to make install and pkgconfig description and fix its library path



git-svn-id: http://svn.pjsip.org/repos/pjproject@4781 74dad513-b988-da41-8d7b-12977e46ad98
More re #1743: also added code snippet to make routing selection stick even when earpleace is plugged in/out. But this doesn't seem to work (tested on Q10 OS 10.2.1)

git-svn-id: http://svn.pjsip.org/repos/pjproject@4782 74dad513-b988-da41-8d7b-12977e46ad98