[UWS] Add configuration file to build and configure a UWS service.

src/tap/config/tap_configuration_file.html

src/tap/parameters/TAPParameters.java

src/uws/config/ConfigurableUWSFactory.java

src/uws/config/ConfigurableUWSServlet.java

src/uws/config/UWSConfiguration.java

src/uws/config/uws_configuration_file.html

src/uws/config/uws_full.properties

src/uws/config/uws_min.properties

src/uws/job/parameters/DurationParamController.java

src/uws/job/parameters/NumericParamController.java

src/uws/job/parameters/StringParamController.java

src/uws/service/UWSService.java

src/uws/service/actions/ShowHomePage.java

test/uws/config/TestConfigurableUWSFactory.java

test/uws/config/TestUWSConfiguration.java

test/uws/job/parameters/TestDurationParamController.java

test/uws/job/parameters/TestNumericParamController.java