Fix CheckIdentifierNotPurelyNumerical so it does not use IntFromString
format() function
Fix note about concatenation of search_mode in file_select
Fixes #2568. JoinSuffix should not be used here.
Fix CheckIdentifierNotPurelyNumerical: return false/true not 0/1 and no single-line ifs
Make negative look-ahead only match exact lines
Merge pull request #637 from bheilman/correct_maintain_key_values

cfengine_stdlib.cf: Make negative look-ahead only match exact lines
Merge pull request #630 from jeffali/fix/2568

Fixes #2568. JoinSuffix should not be used here.
Merge pull request #627 from nickanderson/fix/2593

Fix note about concatenation of search_mode in file_select
Merge pull request #610 from tzz/tzz/redmine-1193-purely-numerical-identifiers

Redmine#1193: Fix CheckIdentifierNotPurelyNumerical so it does not use IntFromString
Fix merged CheckIdentifierNotPurelyNumerical. My bad.
Merge remote-tracking branch 'tzz/tzz/sprintf_formats'