In the UI, allow primary keys to be any type, and test it.

In the UI, allow primary keys to be any type, and test it.

* src/main/java/org/glom/web/shared/TypedDataItem.java:
        Added isUnknownType() for convenience.
        * src/main/java/org/glom/web/client/place/DetailsPlace.java:
        getToken(): Move some code into getStringForData() and handle
other data types.
        * src/main/java/org/glom/web/server/Utils.java:
        Added transformUnknownToActualType(), to parse the unknown string
as a particular type of data. This should correspond with
getStringForData() above.
        * src/main/java/org/glom/web/server/ConfiguredDocument.java:
Add setDataItemType() to set the type of data for primary
keys.
        getDetailsData(), getSuitableRecordToViewDetails():
Call it, to have the correctly-typed primary key value.
We do it here, on the server, instead of before, because it
is only here that we can know the field type that is in the
document.
        * src/test/java/org/glom/web/client/place/DetailsPlaceTest.java:
        Added testGetPlaceParametersNumericPrimaryKey(),
testGetPlaceParametersBooleanPrimaryKey() and
testGetPlaceParametersDatePrimaryKey).