Clear up 'body' deprecations

Merge pull request #50 from Geod24/remove-lock

Remove dub.selections.json

Merge pull request #49 from joseph-wakeling-frequenz/fix-taggedalgebr…

…aic-support

Fix support for more recent taggedalgebraic versions

Merge pull request #40 from BBasile/dip25

make compatible with `-dip25`

Compile fixes for latest DMD versions.

Long value fixes.

Removes the original opt() and contains some general improvements.

New opt2() function + doc improvements

Only test on DMD 2.068 and fix example.