op.c: Improve invmap_dump output

[khwilliamson]

An inversion map is a basic data structure for handling Unicode. Currently the only place where it is output from C is in op.c. This code had problems with keeping columns vertically aligned. This commit fixes that, and makes the output look more generally harmonious

Here's an example before this commit:

[0] 0x0000 .. 0x0060        TR_UNLISTED
[1] 0x0061 .. 0x007A        0x0061
[2] 0x007B .. 0x007F        TR_UNLISTED
[3] 0x0080 .. 0x07FF        TR_UNLISTED
[4] 0x0800 .. 0xFFFF        TR_UNLISTED
[5] 0x10000 .. 0x1FFFFF     TR_UNLISTED
[6] 0x200000 .. 0x3FFFFFF   TR_UNLISTED
[7] 0x4000000 .. 0x7FFFFFFF TR_UNLISTED
[8] 0x80000000 .. 0xFFFFFFFFF       TR_UNLISTED
[9] 0x1000000000 .. INFTY   TR_UNLISTED

and after:

[0]            0 .. 0x60         TR_UNLISTED
[1]         0x61 .. 0x7A         0x61
[2]         0x7B .. 0x7F         TR_UNLISTED
[3]         0x80 .. 0x7FF        TR_UNLISTED
[4]        0x800 .. 0xFFFF       TR_UNLISTED
[5]      0x10000 .. 0x1FFFFF     TR_UNLISTED
[6]     0x200000 .. 0x3FFFFFF    TR_UNLISTED
[7]    0x4000000 .. 0x7FFFFFFF   TR_UNLISTED
[8]   0x80000000 .. 0xFFFFFFFFF  TR_UNLISTED
[9] 0x1000000000 .. INFINITY     TR_UNLISTED

[jkeenan]

How would one trigger this (before/after) with perl at the command-line?

[khwilliamson]

On a DEBUGGING build, run something with tr///, like t/op/tr.t using the -Dy or -Dyv options