Added isodd operator

[mkay]

Added an operator that checks if subject is odd or even.
Passes if the subject is an odd integer.

I needed this for generating empty table cells in getResources' &tplLast:

<td>[[+content]]</td>
[[!If? &subject=`[[+total]]` &operator=`isodd` &then=`<td>&nbsp;</td>`]]

hope it's useful.
Mika

[jpdevries]

Given that If has historically included counter arguments (like isempty,empty), I think for something like this to be added it should also come with:

• iseven
• isnumber
• !number

[algorski]

IMHO, this operator is excessive, because the call of

[[!If? &subject=[[+total]] &operator=isodd &then=<td>&nbsp;</td>]]

may be represented as

[[!If? &subject=[[+total:mod]] &operator=notempty &then=<td>&nbsp;</td>]]