Preparation for release 1.11

Preparation for release 1.10

Preparation for release 1.09

Compute FIONREAD for BSD/macOS (RT 125662)

…so as to avoid requiring sys/ioctl.ph (often unavailable)

Preparation for release 1.08_01

Preparation for release 1.08

Preparation for release 1.07

Separately test native/TkPNG and TkImg formats

Skip PNG output tests on Tcl/Tk 8.6.5-8.6.6
which output invalid PNG files
https://rt.cpan.org/Ticket/Display.html?id=128803

wmStackorder.t: mark as TODO

…due to unresolved failures reported by testers

https://rt.cpan.org/Ticket/Display.html?id=132100

Preparation for release 1.05