Prepping for release. v2.7.0

Fix an MSN emoticon crash discovered by Pierre Noguès of Meta Security.

Use /dev/null for the purple directory for the tests.

Add lib/libgadu-internal.h to EXTRA_DIST and INTGGSOURCES

merge of '12657e7671923933535ff98876ef0a1866a4b688'

textwidth=72 and double space at the end of sentences.

merge of 'f449bab1d9eebdf6ec93dd9ae886d47622e6c613'

... and the double spaces...

As Qulogic pointed out, this is a minor release, but I re-phrased it,

NEWS... and spelling and grammar and word-wrap...

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