changing signature of IPowerSupply according to issue#2 and propagate changes to RigolDP832 class

I started working on addressing issue #2 (closed).

• changed signature of IPowerSupply to clarify what each function does. Remove initialise, introduce reset.
• added program (implemented in IPowerSupply) and checkCompatibility function
• implemented program for Rigol class as an example
• switch to using exceptions for error handling in IPowerSupply
• replace example power supply programs with powersupply that supports EquipConf

Elisabetta

Can you make the title more descriptive? This is what will appear in the commit message once this is merged.

changed title from WIP: Addressing Issue #2 to WIP: changing signature of IPowerSupply according to issue#2 and propagate changes to RigolDP832 class

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• 8b011051 - remove initialise, add reset. Move program implementation to IPowerSupply.

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• bad0595d - make program virtual member of IPowerSupply class

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Dear @theim @kkrizka @emladina @spagan,

I addressed all comments by @kkrizka, and I moved the implementation of program back to IPowerSupply.

There are few items associated with issue#2 that I didn't address, and I motivated it in the issue.

Please, let me know if you have comments or suggestions - I'd like to merge the branch devel_issue2 to devel by early next week, and then start to migrate all PS class to inherit from IPowerSupply.

Cheers, Elisabetta

mentioned in issue #3 (closed)

One more request, which I missed earlier as it was already part of devel. Can you change any string arguments to functions from std::string to const std::string&?

Also should we move to exception here?

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