Large html size

This is a followup to #205.

Whilst removing the list of modules, files etc. has helped reduce the overall size of the generated documentation still remains relatively large.

I'm not very familiar with html development so it may just be that my expectations are unrealistic but for a project with approximately 100k lines the generated documentation is around 80MB with `graphs = false`, `source = false` and `search = false`. The majority of the usage seems to be in the files in `proc` (around 3000 procedures = ~ 30MB) and `sourcefiles` (151 files =~ 30MB).

I was able to shrink things by around 10% with `htmlmin` (by running `for f in $(find ./html -name '*.html') ; do htmlmin ${f} ${f} ; done`) although this was quite slow.

Are there any other strategies that could be used to reduce space requirements?