Replace MYSQL_inc with MYSQL_CFLAGS

Part of #1748
Replace MYSQL_lib with MYSQL_LIBS

Part of #1748
Count the number of NOTIFY packets received
Lowercase usage text just like the other ones
oraclebackend: fix records pointing at root
Merge pull request #1955 from mind04/oracle

oraclebackend: fix records pointing at root
Merge pull request #1951 from rubenk/lowercase-option

Lowercase usage text just like the other ones
Merge pull request #1945 from rubenk/count-nr-of-notifies

Count the number of NOTIFY packets received
Merge pull request #1914 from rubenk/make-mysql-flags-consistent

Make mysql flags consistent
Check for PIE, RELRO and stack protector during configure