Moved enumtypes.[ch] to gswe-enumtypes.[ch] for naming consistency
Created data/Makefile to install SwEph related data files

Also, SwEph data files has been moved to sweph-data for better separation
Changed documentation version number to reflect API version
Added all header files for installation candidates
Renamed project from 0.1 to 1.0
Fixed enumtypes.[ch] problems due to renaming
Fixed datafiles installation problems
gswe_init() requires no parameters from now on

SwEph path is automatically initialized to $(pkgdatadir)
Added files generated by GObject Introspection to .gitignore