Fix ideal.lib; fixes #258

[Radvall]

Added SPICE models for: BPF2, HPF1, Ideal, LPF1, Notch2, Diff, HPF2, Int, LPF2, VDelay provided by @tomhajjar in #258. Library order updated.

I don't find new OpAmp model so I fix existed SPICE model and rebuilt ABS, AP1, AP2, Quantizer and Limiter models, now it should works in ngspice.

The table below shows summary results of testing ideal.lib after the changes were made.

Component	qucsator	ngspice
VSum	✔	✔
VSub	✔	✔
Mul	✔	✔
Div	✔	✔
Sqrt	✔	✔
Int	✔	✔
Dif	✖	✔
Abs	✔	✔
VDelay	✔	✔
VCO	✔	✖
Quantizer	✔	✔
OpAmp	✔	✔
Limiter	✔	✔
HardLimiter	✔	✔
LP1	✖	✔
LP2	✔	✔
HP1	✔	✔
HP2	✔	✔
BP1	✔	✔
Notch2	✔	✔
AP1	✖	✔
AP2	✖	✔

For testing I used Qucsator 0.0.20 and ngspice-41. Simulation project for testing attached

Ideal_Library_Models_Test_prj.tar.gz
Ideal_Library_Test_prj.tar.gz

Voltage Controlled Oscillator subcircuit contains phase modulated source which is missing in ngspice. So I don't know how implement in QUCS-S.

Simulation results for ABS, AP1, AP2, Quantizer, HardLimiter, Limiter and OpAmp are shown bellow:

[tomhajjar]

Sergei Your work looks good. I incorporated your work and fixed Sum, Div and Sqrt. Attached are the two projects. The new Ideal.lib is in both projects. [Ideal_Library_projects.zip](https://github.com/ra3xdh/qucs_s/files/13807145/Ideal_Library_projects.zip)

[Radvall]

Sergei Your work looks good. I incorporated your work and fixed Sum, Div and Sqrt. Attached are the two projects. The new Ideal.lib is in both projects. Ideal_Library_projects.zip

Thanks @tomhajjar you did a great job! I added the missing models, now only VCO doesn't work with ngspice
​

[ra3xdh]

Thanks for contribution! Merged.

[tomhajjar]

Diff never worked in Qucs or QucsStudio.

Here is Ideal.lib with VCO at the end.

Ideal-lib.zip