Apply blanks at EOF

Here is my revised patch series.

Björn Gustavsson (4):
apply: Remove the quick rejection test
Now a separate commit for removing the quick reject and clarifying another test, as well as a new test case.

apply: Allow blank context lines to match beyond EOF
At least one non-blank context line must now match before the end of file. Rewrote my own changes in the beginning of match_fragment() in a way that I think is clearer.

  t4124: Add additional tests of --whitespace=fix
    More test cases.

t3417: Add test cases for "rebase --whitespace=fix"
No changes.

 builtin-apply.c                  |  146 ++++++++++++++++++++++++++++++-------
 t/t3417-rebase-whitespace-fix.sh |  126 ++++++++++++++++++++++++++++++++
 t/t4104-apply-boundary.sh        |    9 +++
 t/t4124-apply-ws-rule.sh         |   85 ++++++++++++++++++++++
 4 files changed, 338 insertions(+), 28 deletions(-)
 create mode 100755 t/t3417-rebase-whitespace-fix.sh