BUG: fix some line width bugs / UI issues

- Use step="any" for the line width inputs, so that l.w. isn't
  restricted to just integers
- Change "Line Width" -> "Extra Line Width" in the UI
- Make the side panel reset functions set the line widths back to 0,
  not 1

there's still a weird thing where switching the layout makes the
new layout have thick lines, even if no thickening was previously
done. huh.

empress/support_files/js/side-panel-handler.js

@@ -124,7 +124,7 @@ define(["underscore", "Colorer", "util"], function (_, Colorer, util) {
                 sSel: { disabled: true },
                 sColor: { value: "discrete-coloring-qiime" },
                 sHideChk: { checked: false },
-                sLineWidth: { value: 1 },
+                sLineWidth: { value: 0 },
             },
             [this.sAddOpts, this.sUpdateBtn]
         );
@@ -137,7 +137,7 @@ define(["underscore", "Colorer", "util"], function (_, Colorer, util) {
                 fChk: { checked: false },
                 fSel: { disabled: true },
                 fColor: { value: "discrete-coloring-qiime" },
-                fLineWidth: { value: 1 },
+                fLineWidth: { value: 0 },
                 fMethodChk: { checked: true },
             },
             [this.fAddOpts, this.fUpdateBtn]

empress/support_files/templates/side-panel.html

@@ -38,9 +38,9 @@
                class="empress-input">
       </p>
       <p>
-        <label for="sample-line-width">Line Width</label>
+        <label for="sample-line-width">Extra Line Width</label>
         <input id="sample-line-width" type="number" value="0" min="0"
-               class="empress-input">
+               step="any" class="empress-input">
       </p>
       <p>
         <button id="sample-update" class="hidden">Update</button>
@@ -73,9 +73,9 @@
         </label>
       </p>
       <p>
-        <label for="feature-line-width">Line Width</label>
+        <label for="feature-line-width">Extra Line Width</label>
         <input id="feature-line-width" type="number" value="0" min="0"
-               class="empress-input">
+               step="any" class="empress-input">
       </p>
       <p>
         <label for="fm-method-chk">Only use tip-level metadata?</label>
@@ -137,9 +137,9 @@
            class="empress-input">
   </p>
   <p>
-    <label for="animate-line-width">Line Width</label>
+    <label for="animate-line-width">Extra Line Width</label>
     <input id="animate-line-width" type="number" value="0" min="0"
-           class="empress-input">
+           step="any" class="empress-input">
   </p>
   <div>
     <p>