signal Merge Request #1: Implemented idwt (rejected)

Added a simple implementation of the inverse discrete wavelet transform (1D) and tested it with a Haar-wavelet.

[Mike Miller]

Thanks for the contribution. Looks good at a glance, have not yet tested.

Some suggestions:

• Please remove the 3-line author block below the docstrings, you can add your email to the copyright line if you like
• Please use consistent spacing: zeros( should be zeros (, x=utmp+vtmp should be x = utmp + vtmp
• Move the print_usage () case to the top, see other functions
• Can you add test cases to the end of the function? Maybe test dwt and idwt together? See other functions
• Please also add a mention of the new function in the NEWS file and add it to the INDEX file

Let me know if you have any questions or need help with these changes.

[Peter Kleiweg]

There is an error on line 50:

    [Hp, Gp] = wfilters (wname, "d");

This should be:

    [Hp, Gp] = wfilters (wname, "r");