CMake changes:
- Replace text files containing paths to installation, with install commands
- You can set paths as cache variable
- Added new option INSTALL_AFTER_BUILD
Code changes:
- Revert the changes to allow usage for older versions of g2o (like 0.1.9)
This change is only temporary, to publish the release module fo the older g2o versions.
- renamed sqmodule_api.h/.cpp to module_api
- moved defines for sq_* functions into squirrel_api.h
- renamed SqModule::inti to SQModule::Init
- moved all of the files to "api" subfolder