[type1] install simple PFB reader after loading AFM support
[type1] improve PFB reader so it calls the AFM reader where necessary
[type1] generalize PFB loader so we can derive a PFA one
[doc] mention new files in manual
[meta] include new files in status file
[type1] resolve conflict between TFM and AFM loaders
[graph] list AFM support files
Merge pull request #123 from phi-gamma/master

refine AFM support