Decide whether we want to create a flags object inside inset_state (to pass around flags)

[adisidev]

Suggested sensibly by @nihalzp

One potential caveat is that it would hide away some options for some functions to within the functions (i.e. instead of calling function(flag = true) it would become just function(), which might make it confusing in the future what all possibilities exist in the function.

On a related note, we should add the parameter names to the .hpp files, so one can easily look at what all functions are available, and what the parameters actually mean.

[adisidev]

Same as #129