Modify search by catalog form to use GET method instead of POST.

Addressed to #514

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/controller/SeriesController.java

@@ -376,7 +376,7 @@ public String processAskForm(
 		return redirectTo(Url.INFO_SERIES_PAGE, series.getId());
 	}
 
-	@PostMapping(Url.SEARCH_SERIES_BY_CATALOG)
+	@GetMapping(Url.SEARCH_SERIES_BY_CATALOG)
 	public String searchSeriesByCatalog(
 		@RequestParam("catalogNumber") String catalogNumber,
 		@RequestParam("catalogName") String catalogName,

src/main/webapp/WEB-INF/views/site/index.html

@@ -249,7 +249,7 @@ <h4 class="panel-title" th:text="#{t_in_db}">In our database</h4>
 							<h4 class="panel-title" th:text="#{t_search_by_catalog}">Search by catalog</h4>
 						</div>
 						<div class="panel-body">
-							<form method="post" action="../series/search_result.html" th:action="@{${SEARCH_SERIES_BY_CATALOG}}">
+							<form method="get" action="../series/search_result.html" th:action="@{${SEARCH_SERIES_BY_CATALOG}}">
 								<div class="form-group" th:classappend="${numberIsEmpty != null ? 'has-error' : ''}">
 									<label for="catalogNumber" th:text="|#{t_number}:|">Number:</label>
 									<input id="catalogNumber" name="catalogNumber" type="search" class="form-control"