Rename everything, everywhere for SQL Layer

I believe everything is as discussed and agreed upon.

Short list (of big changes):
- This branch includes git-package-changes, as all the same areas are touched
- Java package is com.foundationdb
- Property prefix is fdbsql
- Entry point is sql.Main
- RPM and DEB names are fdb-sql-layer
- Directories (/etc, /var, etc) are foundationdb-sql
- Start scripts are fdbsqllayer

Additionally, a number of comments were simplified or tweaked to shorten grep output for lingering usage.