[Koha-patches] Fixing some typos

[Marc Balmer]

While reading the code I found some typos and fixed them.  The patches
must be applied in order.

0001  functionnal -> functional
0002  wether -> whether
0003  developper -> developer
0004  'the the ' - > 'the '

Please some kind soul sign these off and an even kinder sould commit
them to the master branch ;)

Thanks,
Marc
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