Improve the memory management when setting standard waveforms on AWGenerators

[Henrik_Volkers]

If you want to create low frequencies with AWGs (5422) you need to increase the buffer manually, OK  would be nice to have an option that the driver can do it.... however

currently the driver (seems to) try to fill the buffer at once, allocating huge amounts of memory only to write a standard function.

Ever tried 50mHz@5MS/s  

Please improve the memory management of the FGEN driver by writing smaller blocks...

Spoiler

OK, maybe the 5422 is a 'little' overkill to create a simple 50mHz Sine 😉