Add documentation for the `HIDDEN` keyword in DQL
Add fullstop and newline after property description.
Add missing type mapping

Fixes DDC-3192
Refs DDC-2494

This is essentially a fix from DDC-2494 applied to SQLWalker.
The issue: type was not converted to PHP value when the result is fetched by
executing DQL query rather than using entity manager's findX(). Similar issue
for BasicEntityPersister (which is used when em's findX is executed) was fixed
in DDC-2494, but SQLWalker made the issue valid for any custom query.
Merge pull request #1073 from kamazee/add_passing_type_to_rsm_in_sql_walker

Add missing type mapping
Merge pull request #1067 from albertvolkman/add-fullstop-and-newline

Add fullstop and newline after property description.
Merge pull request #1038 from Greenflex/doc/dql-hidden-keyword

Add documentation for the `HIDDEN` keyword in DQL
Small grammar fix

The exception was reading 

```
A detached entity was found during {removed|persisted} [entityName] 
```

I changed the verbs to infinitive now. Alternatively, the text in ``ORMInvalidArgumentException::detachedEntityCannot`` could also be changed to read 


```
Detached entity [entityName] cannot be {removed|persisted}  
```
Improve phrasing on exception message instead of trying to fix callers
Merge branch 'hotfix/#1019-detached-entity-exception-rewording'

Close #1019