Be more liberal for zero is plural case for matching gfdl

For non native english speaker zero could be singular. Avoid to
trip lintian in the case of this grammar mistake.

[nthykier: Merge of 0001 and 0006]

Signed-off-by: Niels Thykier <niels@thykier.net>
Allow patch symbols as space for gfdl detection

Allow (\n\+|\n-|\n!|\n<|\n>) aka patch marker for gdfl detection

[nthykier:
 * Use a character class rather than alternatives
 * Merge of patches 0002 and 0004.
]

Signed-off-by: Niels Thykier <niels@thykier.net>
Allow <br> and <br/> as space for gfdl license check

[nthykier:
 * Merge 3 patches into one (0004, 0005 and 0007)
 * Make the "/" optional, so the regex also works for HTML
]

Signed-off-by: Niels Thykier <niels@thykier.net>
Be more liberal about gfdl on linking words

And, with etc on the no invariants section could be ommited by upstream.

Signed-off-by: Niels Thykier <niels@thykier.net>
Allow man comments for gfdl invariants

Fix a false positive problem by allowing man comments

Signed-off-by: Niels Thykier <niels@thykier.net>
Allow C comments continuation

* is sometimes used for alignment of C comments. Allow it.

Signed-off-by: Niels Thykier <niels@thykier.net>
Add variant for dict-fold package

dict-fold use a variant syntax that is ok for gfdl with no invariants.

Allow it.

Signed-off-by: Niels Thykier <niels@thykier.net>
Fix a false positive for the gfdl check in case of GNU with under <span> tags

diveintopython trigger false positive due to convoluted license. The solution is better matching
of the license by allowing some HTML tags durings scanning of license text.

Signed-off-by: Niels Thykier <niels@thykier.net>
Fix false positive for detection of gfdl license problem

If text is embeded in C string we have false positive.
Fix it.

[nthykier: rewrite the "$s" regex with comments]

Signed-off-by: Niels Thykier <niels@thykier.net>
Allow break at hyphen for detection of gfdl

front-cover could be written as front-\ncover. Allow it.

Signed-off-by: Niels Thykier <niels@thykier.net>