Script restructuration

Remove the "cron" directory
Cleaner shell script and setup script

It's not perfect already (missing some common config file for the shell
scripts), but it's now easier to install and safer to update:
* simply type ./scripts/setup.sh to set up the mesa repository
* uses Xenopathic's way of getting the file and the log - it's way
  better
* the shell scripts now get into their base directory, so the relative
  paths always points to the correct absolute path
* change "src/" to "/http/src" in .gitignore