- Update to version 4.2.1:
  * See
    https://github.com/vermaseren/form/wiki/Release-Notes-Form-4.2.1
    for a full list of changes.
  * Bug fixes:
    - Replaced the obsolete ftime() function with clock_gettime()
      when the latter is available (gh#vermaseren/form#276)
    - Improved the algorithms of division and reminder for
      non-monic multivariate polynomials (gh#vermaseren/form#281)
    - Removed an inefficiency when many expressions are defined
    - Improved the merge sort inside memory based on Timsort
    - Fixed a bug that caused a pattern matching failure for
      restricted numbers in ex-Polyratfun (gh#vermaseren/form#55)
    - Fixed crashes in routines for gzip decompression
      (gh#vermaseren/form#95)
    - Fixed content_ for polynomials with constant terms
      (gh#vermaseren/form#185)
    - Fixed some portability issues (gh#vermaseren/form#217,
      gh#vermaseren/form#223)
    - Fixed corrupted characters from the prepreocessor calculator
      when the result is the most negative integer
      (gh#vermaseren/form#219)
    - Fixed a crash on accessing the first
      gh#vermaseren/form#factdollar factor of an integer
      (gh#vermaseren/form#222)
    - Fixed memory leaks in routines for gzip compression
      (gh#vermaseren/form#248)
    - Fixed a memory bug for local $-variables in TFORM
      (gh#vermaseren/form#253)
    - Fixed a bug that made gcd_ give wrong results
      (gh#vermaseren/form#258)
    - Fixed a bug in the polynomial GCD routine
      (gh#vermaseren/form#260)
    - Fixed a wrong "Division by zero" runtime error by mul_(x,0)
      (gh#vermaseren/form#261)
    - Fixed a bug that caused wrong results in code optimization
      (gh#vermaseren/form#272)
    - Fixed transform,addargs for the case that the result becomes
      0 (gh#vermaseren/form#277)
    - Fixed some bug in LHS patterns with poly(rat)fun and symbols
    - Fixed the problem that content_ did not handle functions
      properly
- Disable documentation due to LaTeX errors.

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