DOCS-1839: moving external sort to command documentation.
DOCS-1980, DOCS-1934, DOCS-1935, DOCS-1936 user-defined roles

Signed-off-by: kay <kay.kim@10gen.com>
DOCS-1980, DOCS-1934, DOCS-1935, DOCS-1936 UDR feedback from Spencer and some rewrite/reorg
DOCS-1834 audit feature
2.6: structure around new aggregation operators.
minor: whitespace and link fix
sitemap: adding sitemap masterfile to the build migration
rn: fixing word wrapping of title
clarify min/max wire version
DOCS-2092 modulo operator
DOCS-1575 x509 authentication