Log Message:
tex-tex-gyre{,-doc}: update to 2.501

Updates to TeX Gyre Adventor and Pagella in version 2.501:

 * substantial extension of the repertoires by geometric, math and
   technical symbols, in OTF, files stylistic feature ss10 (backward
   compatibility with old math symbols) added, marks (anchors) implemented

 * only one aggregate map (for each) is included for all encodings

 * the contents of the source/fonts/tex-gyre/ directory changed; most
   importantly, it contains source *.sfd files

 * the relevant LaTeX files haven't been changed, they just got a new time
   stamp