Remove duplicated code

[alexxcons]

In GitLab by @alexxcons on Feb 22, 2019, 12:23

struct Ps3000aMaker : BlockMaker .. same code for 4000 and 6000 scopes

[alexxcons]

In GitLab by @alexxcons on Mar 21, 2019, 09:58

marked this issue as related to gr-digitizers#12

[alexxcons]

In GitLab by @alexxcons on Mar 21, 2019, 09:59

First check if we need the package gr-flowgraph at all: https://gitlab.com/al.schwinn/gr-digitizers/issues/42