Add option to stop rieMiner when a tuple is found in Search mode

[MakisChristou]

No description provided.

[Pttn]

Your code stops the search when primeCount > _parameters.tupleLengthMin, but tupleLengthMin can be set by the TupleLengthMin option, so it might stop before finding a constellation of desired length. For example, if I am looking for 8-tuples, but want to see 6-tuples and set TupleLengthMin = 6, the search will stop as soon as a 7-tuple is found.
You can use the length of the Vector storing the Pattern instead.

KeepRunning should be documented in the ReadMe.

Nitpicking:

• Since _options.keepRunning is a Bool, it would be a bit nicer to assign true/false rather than 1/0.
• Put keepRunning(0) after port(28332) (or declare keepRunning after apiPort) so the Initializer List Order is the same as the Member Declarations'. Otherwise, the compiler may warn "... will be initialized after ... when initialized here".

[MakisChristou]

Thanks for the feedback. Better now?

[Pttn]

Looks good now, thank you for the contribution!