Add 6AL5 twin diode tube

[bitomaxsp]

Add 6AL5 twin diode tube symbol

Datasheet URL: https://frank.pocnet.net/sheets/093/6/6AL5.pdf

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All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing
• Provide a screenshot of the symbol(s) from the symbol editor with the pin types visible
• Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.

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Be patient, we maintainers are volunteers with limited time and need to check your contribution against the datasheet. You can speed up the process by providing all the necessary information (see above). And you can speed up the process even more by providing additional info like the screenshot of the symbol editor pin table (or for high pin counts converted to csv) sorted in the same way as the pin table in the datasheet and a direct link to the datasheet page that contains the pin table.

[CLAassistant]

All committers have signed the CLA.

[bitomaxsp]

Unit A

[bitomaxsp]

Unit B

[bitomaxsp]

Unit C - Heater

[myfreescalewebpage]

To be reviewed after #1649 which is making a large change in the lib

[myfreescalewebpage]

@bitomaxsp first steps of the review right now:

• Fp filter should be Valve*Mini*P*
• Unit C: the design of the heater should be consistent with the design on other symbol
• Unit C: can you add the shielding pin please ?

Joel