Problems with documentation makefile/scripts

[Roger-Shepherd]

Preparing to update the doc/README.doc to reflect the added support for macho I have some problems with the scripts/Makefiles in doc.

1. Regarding spelling checking, the command line for hunspell is hunspell -p custom.wordlist -l -d en_US. I think the standard dictionary is en-US. With that fix
2. The spelling checker throws out a lot of words. Should I add these to the custom.wordlist?
3. make toc doesn't work for me. It produces a new version of README.md with the all the text prior to
   <!-- End of ToC insertion --> removed but no new toc. I don't know how to debug this.

[Roger-Shepherd]

The problem with make toc is that gentoc.sh assumes the use of gnu sed and uses some gnu specific extensions.

1. \? which can be replaced by \{0,1\}
2. 0,/regexp/ which can be replaced by 0,/regexp/ unless regexp matches the very first line of input. This should not be the case.

[PaoloS02]

Solved with PR #132