Request: Document what the --strict option does

[louie-github]

From what I have learned by skimming through some issues and asking around, using --strict does these things:

• Keep pixel values of completely transparent alpha channels in PNG files
• Do not recursively optimize ZIP files

Is there anything else this option does? I think it would be useful to document it somewhere, either in the README or in the help string.

Additionally, as a side note, you should probably add --help as an option to ECT.

Thank you!

[fhanau]

That's about it – the only other thing is refusing to process gzip files that contain metadata (comment or extra field) which would be removed otherwise. I'll look into documenting this better.
For ECT's help interface, run the program with no arguments, -h or -help.