alt namespace

Whole library should be enclosed in something like alt:: namespace.

I really don't like having our cli:: (and others) namespaces as the top-level ones. It can interfere with namespaces from external projects.

also we should revisit structure and namespaces in gui and graphs

I will encapsulate whole project into alt::.

@travnja3 - do you agree? Or do you propose another namespace?

Sure thing.

created branch 185-alt-namespace to address this issue

$ ./debug/aql2/aql2 
> introspect algorithms
alt::arbology::exact::BoyerMooreHorspool
alt::arbology::exact::DeadZoneUsingBadCharacterShiftAndBorderArray
alt::arbology::exact::ExactNonlinearTreePatternAutomaton
...

mentioned in commit 2a15b598

mentioned in issue #201 (closed)

mentioned in commit c8bebf90

mentioned in commit 9db8d6d5

mentioned in commit d66e84d5

mentioned in commit 4f6ea185