This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
--forceentry=TEXT will override any entries contained in the info
file. Second, I made it recognize that "gmp" and "gmp.info" are
the same when looking for whether the info file being installed is
already installed.
intelligent enough to take default section and entry names
for the purpose of being able to use it on old texinfo files
in the source tree. This involved very minor modifications and
the new options --defsection and --defentry which behave just like
--section and --entry but ignore their argument if the info file
is annotated with the information. This change should only be
neccesary as long as there are old-style texinfo source in the tree.
