globbing supports character classes now and ^EN string building construct to escape glob patterns

 * globbing is fnmatch(3) compatible, now on every supported platform.
 * which means that escaping of glob patterns is possible now.
   ^ENq has been introduced to ease this task.
 * This finally allows you to pass unmodified filenames to EB.
   Previously it was impossible to open file names containing glob wildcards.
 * this was achieved by moving from GPattern to GRegex as the underlying
   implementation.
 * The glob pattern is converted to a regular expression before being
   compiled to a GRegex.
   This turned out to be trickier than anticipated (~140 lines of code)
   and has a runtime penalty of course (complexity is O(2*n) over the
   pattern length).
   It is IMHO still better than the alternatives, like importing
   external code from libiberty, which is potentially non-cross-platform.
 * Using GRegex also opens the potential of supporting brace "expansions"
   later in the form of glob pattern constructs
   (they won't actually expand but match alternatives).
 * is_glob_pattern() has been simplified and moved to Globber::is_pattern().
   It makes sense to reuse the Globber class namespace instead of using
   plain functions for functions working on glob patterns.
 * The documentation has a new subsection on glob patterns now.
 * Testsuite extended with glob pattern test cases

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