HACKING file changes

[Frank Ch. Eigler]

Hi -

I'm committing the following to src/HACKING.  The changed version
points to the recently populated NEWS file as a place to record, well,
news.

Index: HACKING
===================================================================
RCS file: /cvs/systemtap/src/HACKING,v
retrieving revision 1.6
diff -r1.6 HACKING
62c62,63
<   changes should be documented in the stap.1 man page.
---
>   changes should be documented in the stap.1 man page and emphasized
>   in the NEWS file.
72,74c73,77
<   in stapfuncs.5, stapprobes.5.  Internal function, variable, probe
<   identifiers should be prefixed with "_" for extra uniqueness, and
<   not documented in the man pages.
---
>   in stapfuncs.5, stapprobes.5.  Major or incompatible changes should
>   be mentioned in the NEWS file.
>
>   Internal function, variable, probe identifiers should be prefixed
>   with "_" for extra uniqueness, and not documented in the man pages.