Buggy handling of filenames

[ytmytm]

Tomas Vondracek reported:

I tried copy files from 1541 to DD-001 via "slash" and "left arrow" in Basic. The files are ok, but the saved file at DD-001 doesn't include any extension and can't be loaded via "arrow up" right from the directory. You have to type the filename manually.

Need to check:

• how files without extension are stored (probably spaces)
• how the filename matching in FindFile deals with missing extension
• is there a difference if you load "NAME" vs "NAME." vs "NAME.<space><space><space>" vs "NAME.*" vs "NAME*"

Expected behavior probably should be that "NAME" (without dot) means "NAME.*".

I don't think we can drop name.ext DOS convention becuase exchanging files with PC would become much more difficult and/or impossible if illegal (for MSDOS) names are created.

[ytmytm]

One more nitpick : for CBM DOS 0. and 0 are two different files. Not so for MS-DOS/FAT.