Fix OpenBSD total RAM output. Un-camelCase the *box WMs.

Using top for total RAM on OpenBSD is very wrong. Use the proper sysctl and divide out to get MBs.
The three *box WMs do not camelCase their names, so screenFetch should not either.

Also, you include a copy of the GPLv3 and claim that screenFetch is distributed under the GPLv3. However, the script itself contains the MIT license, without reference to the GPL. You should choose one of the two licenses.