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Add optimized functions (strict folds on Map; concat for 3-5 strings)

See merge request !363

These optimized functions are faster than the general `concat`.

Add CI for x86 linux

Closes #89

See merge request !361

Remove unused functions from Data.Set

Closes #94

See merge request !362

fromString JSONNode: do not parse trailing period (e.g. "0.") as part of a number; only when followed by a digit

Remove Maybe synonym and corresponding macros; import StdMaybe functionality in Data.Maybe

Closes #99

See merge request !360

Remove what seems to be the last usages of the old Maybe type

See merge request !359

Replace old Maybe type in remaining modules in Data

See merge request !356

- Remove unused functions
- Use new maybe type
- Fix formatting

Adapt to new TCPIP library with strict maybe type

See merge request !358

fix JSON decoding of unit values as record fields & extend test to cover the fixed case

See merge request !357

Use new maybe type in Data.Map, Data.Set, and Data.SetBy, and clean up Data.Map

See merge request !355

- Remove unused local functions
- Move documentation to dcl
- Use new maybe types
- Fix indentation

Still more can be done, but I focused on those parts which I was editing
anyway to remove the old `Maybe` type in this module.

Use new maybe type in a number of Data modules

See merge request !354

add missing import to implementation module Control.Monad.Fail

See merge request !353

Use new Maybe type in Text.GenJSON, Clean.*, and some other places

See merge request !350