table/writer.go: Fixed a race condition that could occur when more th…

…an 1 leveldb database was opened.

table/reader.go and writer.go: Use klauspost/compress/flate instead o…

…f compress/flate and use zlib level 5 by default.

Renamed everything `dragonfly-tech` to `df-mc`.

Renamed everything `dragonfly-tech` to `df-mc`.

Renamed everything `syndtr` to `dragonfly-tech`.

Thanks for making me do this go modules. -.-

Changed go.mod module name.

Changed go.mod module name.

table/reader.go: Re-use the same zlib Reader, which saves a lot of al…

…locations.

table/reader.go: Re-use the same zlib Reader, which saves a lot of al…

…locations.

Flate compression has a different compression ID.