Merge pull request #39 from thgh/master

Essential part of miner.conf editor
Merge pull request #40 from thgh/master

Solve errors in log, require to repeat password when changing
Merge pull request #41 from thgh/master

Added: download a stored backup as .zip
Merge pull request #42 from thgh/master

Much better backup page
Changed text from "Toggle charts" to "Display extended charts"
Add clarity by changing chart visibility text based on the visibility state

If charts are hidden, text is "Display extended charts". If charts are visible, text is "Hide extended charts".
Restore and import backup functionality
90% tested
Needs zip installed
Needs 770 on directories etc/ and var/ (possibly 777?)
Works :-)