add reminders for Qt 5.0

* QChar::NoCategory is a `fake` category since there is no relevant equivalence
for it in the Unicode specs; the default category for
invalid/unassigned codepoints is QChar::Other_NotAssigned.
QChar::NoCategory already caused some troubles in the past, so let's remember
that lesson and do not repeat this mistake anymore;

* QChar::Unicode_Unassigned == 0 and thus it is less than any other QChar::UnicodeVersion value
that makes test for unassigned (in some Unicode version) codepoints a bit more complex
(eg `if (v == QChar::Unicode_Unassigned || v > QChar::Unicode_3_1)` to check
if some codepoint is unassigned for Unicode 3.1);

* QChar::Punctuation_Dask was just a typo.

Merge-request: 947
Reviewed-by: Thiago Macieira <thiago.macieira@nokia.com>

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