Support !!positions parser test mode

And use it for the group use prefix position test that was
previously implemented as a separate test.

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the t

Introduce ErrorHandler

Add ErrorHandler interface, as well as ErrorHandler\Throwing
and ErrorHandler\Collecting. The error handler is passed to
Parser::parse(). This supersedes the throwOnError option.

NameResolver now accepts an ErrorHandler in the ctor.

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Add Error::getMessageWithColumnInfo()

Add dumpComments option to NodeDumper

Adding this as an option to avoid breaking people's tests.

Some of the test results show pretty clearly that we are incorrectly
assigning t

Add dumpComments option to NodeDumper

Adding this as an option to avoid breaking people's tests.

Some of the test results show pretty clearly that we are incorrectly
assigning the same comment multiple times for nested nodes (mentioned
in #36).

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Rename ParserInterface to Parser

And drop the alias of Parser to Parser\Php5.

Split parsing tests into code tests and other stuff

And run the other stuff against Php5 and Php7 parsers.

Also move canonicalize() from CodeTestAbstract into a free-standing
fu

Split parsing tests into code tests and other stuff

And run the other stuff against Php5 and Php7 parsers.

Also move canonicalize() from CodeTestAbstract into a free-standing
function.

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