Loads a character encoding vector from from a file and
changes the fonts encoding vector to it. As a PostScript
fonts default vector lacks most of the character positions
above 127, you'll definitely want to change this if you use
an other language than english. The exact format of this file
is described in T1libs documentation. T1lib comes with two
ready-to-use files, IsoLatin1.enc and IsoLatin2.enc.
If you find yourself using this function all the time, a
much better way to define the encoding is to set
ps.default_encoding in the configuration
file to point to the right encoding file and all fonts
you load will automatically have the right encoding.