Make 2.6.0 releasev2.6.0

This release tightens up syntax checking and adds all the warnings
generated by the C implementation (plus a few extra ones), making
Kconfiglib more viable as a replacement for the C tools, rather than
just being an auxiliary library.

Syntax checking changes:

 - a84848b ("Tighten up syntax checking")
 - 8716316 ("Generate a parse error for extra tokens at EOL")
 - 416083a ("Flag constant symbols where they're not allowed")

Warning changes:

 - 9c309400 ("Add some post-parsing warnings")
 - da0bfa3a ("Error out for malformed hex/int/string defaults")
 - 5d2041a9 ("Add more choice type and prompt sanity checks")
 - 67f825fc ("Warn if there's more than one help text")
 - 990c780f ("Add some warnings related to selects and implies")
 - 7432ade8 ("Warn if a symbol is defined with multiple types")
 - 5eeea863 ("Improve int/hex sanity checking")
 - ad94bb45 ("Sanity-check range values")
 - e930c140 ("Warn if a symbol/choice has multiple prompts")
 - 60d12911 ("Warn if help text is empty")
 - d43d2e83 ("Warn if menuconfig statement has no prompt")
 - 3db12f72 ("Warn if a choice symbol has defaults")
 - 0eadd61c ("Warn if choice symbol has prompt outside choice")

Also includes various code nits.

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