Add info about sysctl.conf so that the settings are preserved.

I chuckled reading that my virus protection software might flag the miner binary as “male ware,” and rewrote that section of the documentation.

I expect that link is something that would be easily lost if another item is added.

- rename all `xmr` to `monero`
- be insensitive while check for set currency
- add function to compate two strings insensitive

- add CMake flag description
- announce Monero and Aeon in README.md
i add FAQ section

- add more documentation
- split documentation into different files