Revert "Use both dbsetversion() vs. dbsetlversion. Partially reverts #62."

This reverts commit 8f9fda82f4bae32f2c5ab4ea830e95c78433d747.
Revert "Prepare for 0.6.0 release."

This reverts commit d953a925eb87929db73585d77750c4feebca0474.
Revert "Remove old notes."

This reverts commit e09270de5a29b5d6df435949d0514f7cfcc91a7d.
Revert "Show SQL concat works. Fixes #107."

This reverts commit 1ae81a46c24496d000806edd0ac85aef4633e99b.
Revert "Use dbsetversion() vs. dbsetlversion. Fixes #62."

This reverts commit 6389854ef1ba2905c6d93a1fe7c4c934dd8fa4b2.
Revert "Fix stored procedure return code example in README. Fixes #119."

This reverts commit f573840d7907f2e15291e225ca08901e1574efe6.
Revert "Remove Ruby 1.8 and 32-bit support."

This reverts commit 87365c4115ad56854727156651ca348acd7d284d.