Rename protobOT lib to otprotob.
For consistency and setting up for modded build system.
Split off otext lib (misc C src and extras) from main C++ core.
Dedicated C++ build for OT*.cpp rather than pre-processor build.
Disable extreme debug and optimisers, now use libtool default "-g -O2".
Update linux docs version.
Merge pull request #202 from randy-waterhouse/master

Upgrade linux build system.