Add --enable-pfelock option to ./configure
Add .gitignore file
Add pfelock src files
Add pfelock as src folder to Makefile.am
Add pfelock Makefile.am
Change pfelock.c and pfelock.h to link-time wrapping
Add Conditional compilation for pfelock
Add compilation instructions for pfelock in src/Makefile.am
Fix some compilations errors