Fixing resetting of page=0 to 1

[OlegKi]

Hello Tony,

after writing the answer on stackoverflow I analysed the code of jqGrid where page, lastpage and records are used and especially where page will be read from JSON or XML. The current jqGrid code ignore numeric 0 input value and additionally reset page value 0 to 1 before starting or reloading (in populate).

I suggest to fix the code by usage of existing intNum function which do exactly what one needs. Additional advantage will be conversion of page, lastpage and records directly to number. The parameters will be used in many places of the code in compare operation (like < or ===) and usage numbers simplify the logic. Moreover one will fix additionally wrong input values of page, lastpage and records directly to default values.

Best regards
Oleg