Add FET option to simulator (Issue #209) Add a third radio button for the FET option. Mostly equivalent to SSR, but with different values for max current and on-resistance (and voltage, but that happens to be the same.)

Restore full-resolution User Guide I used Word's "Reduce File Size" option before committing the updated User Guide. But some of the figures are a bit blurry now. Although the Word doc was reduced by over a factor of two, the PDF was only reduced from 6 MB to 5.1 MB. I decided to restore the full resolution Word doc and PDF. I will not update release v2.8.0, however. This does mean that the PDF that comes up from the Help menu will be the low res version, but that's ok. Next release will be back to the higher resolution. There are no content changes in this commit. The only differences are the image resolutions.

Suppress pylint no-member error pylint reports this bogus error: IV_Swinger2_gui.py:985:27: E1101: Module 'zmq' has no '__version__' member (no-member) This is because __version_ is generated. Adding the lines to the pylintrc file tells pylint this, and the error doesn't occur.

Update README.md

Update README.md

Update README.md

Update User Guide to v2.8.0 Updated User Guide with new features added in v2.8.0 (instances, remote commands.) Also changed SSR references to SSR/FET. General scrub.

Update LATEST_SKETCH_VER Bumped LATEST_SKETCH_VER to 1.4.6 Also updated the down-level sketch dialog to match the new wording in the User Guide.

Remove version from doc PDF names Remove version number from document PDF file names. This keeps links from breaking when the file is updated.

Catch PermissionError in populate_tree (Issue #208) Add try/except around call to os.listdir and treat PermissionError the same as an empty directory. Also fix a couple lint warnings from previous commit.