v6.63.0. Improvement.

- v6.63.0 January 28, 2014
	- Disabled database writing by default (set `databaseCache` to `false`
instead of `'write"` by default)
		- We never used it, still many naunces with reading to figure out, so
it doesn't make sense incurring the performance penalty of the write
while there is no use for it
		- Enable writing manually by setting `databaseCache` to `"write"`
		- Enable writing and reading manually by setting `databaseCache` to
`true`