Test and document io='omit'

[alanseiden]

Test and document io='omit' (supported by XMLSERVICE)

[alanseiden]

To research 'omit' in XMLSERVICE: https://github.com/IBM/xmlservice/search?q=omit

and from XMLSERVICE changelog: http://yips.idevcloud.com/wiki/index.php/XMLService/XMLSERVICEChangeLog

- 1.2.3 (stable)

IBM i XMLSERVICE:
- ga1 version + all current bug fixes

New functions IBM i XMLERVICE
- ... overlay from previous
- add type='4096h' added type 'hole' for zeros on input, ignored on output
  used to skip "chunks" of complex structure or to overlay data that
  varies by context of the call
- add parm in='omit' added to parm='in|out|both|omit' for OPTIONS(*OMIT)
  P zzomit B export
  D zzomit PI 50A varying
  D myName 10A options(*OMIT) <---- a parameter optionally omitted (*NULL if omitted) 
  D yourName 10A

Internal RPG: 
  - minor release not significantly different