Resolve "Allow olc-is-valid and friends recognize compound codes"

Closes #6

See merge request !8

Resolve "Make nominatim url configurable"

Closes #5

See merge request !7

Resolve "Handle empty response from nominatim"

Closes #4

See merge request !6

Resolve "Improve error checking"

Closes #2

See merge request !5

Resolve "Improve performance of olc-is functions"

Closes #3

See merge request !4

Complete the fix for #1

Closes #1

See merge request !3

Resolve "olc-recover-compound fails on non-compound codes"

Closes #1

See merge request !1