1. There is only one version for maddy and imapsql-ctl utility.
This prevents confusion about compatibility.
2. Modified imapsql-ctl understands maddy config format, this allows
it to read needed values from it without the need for lengthy commmand
line arguments.
Closes#148.
- fsstore is now required, this is reflected by documentation updates.
Upstream commits:
* 8ee5c96 Fix handling of "null" compression
* d6bc61c Add support for zstd compression
* aa76135 Implement support for LZ4 compression support
* cde9a24 Update VersionStr constant
* 2008a7b Remove schema upgrade operations for older versions
* b6668d0 Remove section about Internal/External BLOBs from README
* e91826c cmd/imapsql-ctl: Remove support for reading driver/DSN from text file
* 0dca68f Rename imapsql.Store -> imapsql.FSStore
* 4071c69 Remove support for handling messages in table rows
* 4c8996e Remove most of the code for storing messages in table rows
* b682ac1 Skip header in openBody if needHeader = false
* 2a263c3 Require fsstore to be used
* 45b437d Remove CI job for testing with MariaDB
* 8d30346 Add 'go 1.12' to go.mod
