Add Quad Trims in IDFF

[xresende]

• depends on Fix IDFF device use in IDFF IOC class #1135

TODO:

• tests with IOC classes for IVU18 (trims)
• tests with IOC for DELTA52 (ch, cv, qs)
• rename correctors labels in existing si_idff configurations
• Rename existing IDFF IOC PVs (correctors related)

[xresende]

these past few days I worked on this PR and had completely forgotten about PR #1064, which is now obsolete. But there are naming issues that we discussed there that I considered partially in this new PR. here I used general labels qa, qb and qc instead of the proposed qd1, qf and qd2 in the older PR. what do you think ?

[fernandohds564]

these past few days I worked on this PR and had completely forgotten about PR #1064, which is now obsolete. But there are naming issues that we discussed there that I considered partially in this new PR. here I used general labels qa, qb and qc instead of the proposed qd1, qf and qd2 in the older PR. what do you think ?

I don't know, I think I prefer names directly related to the device names.

[anacso17]

Hi @xresende , I don't know too, what was the idea of the choice QA, QB, QC? It seems to be difficult to relate to the power supply names

[xresende]

@fernandohds564 , @anacso17 , naming issues have been addressed and changes committed in this PR. last machine study I also tried all IDFF IOC (delta + IVUs with trimms) with this PR and they all worked. if you agree with the naming resolution proposed here i consider this PR ready to be merged.