Vincent van Ravesteijn f226c9d3fc Fix bug #6058: Change tracking and versioning.
Computes a hash value for the authors when using change tracking.

Text.cpp, BufferParams.h, Author.h:
  Change unsigned int to int because the hash values can be negative.

lyx2lyx:
  Allow to convert negative author_ids.

See also: r30756.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@36134 a592a061-630c-0410-9148-cb99ea01b6c8
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