[PATCHES] enhancements of sed error messages, using sed on Windows

[Jannick]

Hi,

I spent some time today with sed's new and valuable debug feature. Please
find attached a series of patches as suggestions for your review and which I
would be happy to be committed. I do hope that the commit messages meet the
requirements and the coding is alright.

Some remarks:

#1-2 are meant as suggestions to improve sed's debug features during the
preparation phase when sed commands are read and compiled. This feeds into
the new debug feature lately added to sed (debug.c). 

With #4 sed could be more widely used in Windows' dos shell, in particular
when working through the examples in the sed manual. Please note that sed
exits with an error when (1) sed is compiled with a (gcc compliant) compiler
not belonging to the cygwin family and (2) a sed command like 's/1/2/' is
called from the dos shell (see commit message #4).  This is sadly a
showstopper for many Windows users who fail even in the first example of the
manual and turn away from sed. 

#3 is a minor patch on memory leakage.


If any questions, please let me know. Please feel free to edit anything as
you might think it is best for sed.

Many thanks,
J.

0004-sed-ignore-enclosing-single-quotes-from-command-line.patch
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0001-sed-display-the-error-position-by-caret-for-command-.patch
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0002-sed-enhance-error-reporting-for-script-files.patch
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0003-sed-fix-memory-leakage.patch
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