Log Message:
tex-mf2pt1{,-doc}: update to 2.6

Starting with version 2.6, mf2pt1 no longer automatically generates
a unique ID for the font.  Unique IDs frustrate reproducible builds
of fonts; mf2pt1 generated such IDs randomly, implying that there was
no guarantee of uniqueness; and Adobe has declared that unique IDs
are no longer necessary

In addition, a large number of external links in the mf2pt1
documentation have been updated to point to current locations.