change numbering filenames #67
Merged
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For numbering filenames, added a spin box for the starting number and a spin box for the step size of the numbering in GTK ui file. Did this for both the replace and insert widgets.
Modified the Python code for the replace and insert functions accordingly.
In the replace function, ignore empty find string inputs to avoid unexpected replacement behavior.
The inject function has been modified to allow larger numbers with leading zeros (%n, %0n, %000000n, etc).
fix issue #63 and #66(partly?)