commit (HEAD): more doc iterator work

From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Fri Nov 14 2003 - 14:59:15 EST

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Added some functions to the iterator interface to make it more
flexible, removed a redundant parameter from the PD_StruxIterator
constructor and made ut_contextGlyph to use an iterator.

I have now replaced the rest of the getSpanPtr() calls with the new
iterator, and also removed some dead code from fp_TextRun. I am
inclined to remove the getSpanPtr() functions all together, as in the
past they were sometimes misunderstood and used incorrectly.

files: ut_TextIterator.h, pd_Iterator.h/cpp, fp_TextRun.h/cpp,
fl_BlockLayout.cpp, fp_TestRoutines.cpp

Tomas

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