Merge branch 'maint'

Merge branch 'maint'

* maint:
  compile: use 'compile' script when "-c -o" is used with losing compilers
  HACKING: suggest more checks before releasing
  tests: can fake a compiler not grasping "-c -o" -- globally in all tests
  sync: update files from upstream with "make fetch"
  typofix: in comments in GNUmakefile
  Rename 'maint/' -> 'maintainer/', for Git's sake
  HACKING: minor typofix
  HACKING: bug-tracker, the PLANS directory, and how to plan "big" changes
  HACKING: rewindable branches should live in the 'experimental/*' namespace
  HACKING: fixlets about git branch rewinding policy
  HACKING: commit messages are not to follow GCS ChangeLog rules too strongly
  HACKING: "detailed explanation" in commit messages is almost mandatory
  HACKING: we use "merge --log" even when merging master
  HACKING: typofix
  depend2.am: fix comments on verbosity of compilation rules
  depend2.am: improve comments a little
  plans: automake 1.14 is to assume "rm -f" with no args is OK
  plans: we want to active subdir-objects unconditionally in automake 1.14

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>