#182 $ should be escaped in valid_punctuation

[Lachlan Andrew]

The default value of valid_punctuation contains a
dollar sign. As at 2003-10-14, this is removed by the
config file parser (since it prefixes variables). The
default should be excaped (\$), and a comment should be
added to the descriptions of valid_punctuation and
extra_word_characters.

[Neal Richter]

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Go for it.

[Lachlan Andrew]

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There seem to be some problems with other characters, too.
Eventually, we should update htcommon/conf_lexer.lxx.

1. If the last character on the line is a backslash, then
the following line
is concatenated *even if* the backslash is "escaped" by
another backslash

2. There seems to be no way to escape a back-quote (`).

Are the problems with any other characters?

[Lachlan Andrew]

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3. A file not terminated with a new line causes a core dump.