- raster.c: Need ceilf(symbol->height * si) to avoid heap-buffer-overflow;

also avoid distributive multiplication with floats to lessen chances of
  platform variation (#204 ARM-Cortex crash)
- raster.c: Don't allow for text if scale < 1.0
- raster.c: Cast some indexes to (size_t) to allow for large scale
- vector.c: Check malloc()s and return ZINT_ERROR_MEMORY on fail
- raster/vector.c: various var name changes & other code fiddling
- library.c: Check that scale/height/whitespace/border are reasonable values:
  scale (0.01-100), height (0-500), whitespace_width/height (0-100),
  border_width (0-100)
- CLI: allow both e.g. '-height' and '--height' (getopt_long_only())
- gif.c: fix GIF_ZLW_PAGE_SIZE -> GIF_LZW_PAGE_SIZE
- GUI: allow whitespace/scale to 100

frontend_qt/mainWindow.ui

@@ -830,6 +830,9 @@ in X-dimensions</string>
                  <property name="suffix">
                   <string> X</string>
                  </property>
+                 <property name="maximum">
+                  <number>100</number>
+                 </property>
                 </widget>
                </item>
                <item row="0" column="1">
@@ -841,6 +844,9 @@ in X-dimensions</string>
                  <property name="suffix">
                   <string> X</string>
                  </property>
+                 <property name="maximum">
+                  <number>100</number>
+                 </property>
                 </widget>
                </item>
               </layout>
@@ -876,7 +882,7 @@ in X-dimensions</string>
                 <double>0.100000000000000</double>
                </property>
                <property name="maximum">
-                <double>99.500000000000000</double>
+                <double>100.000000000000000</double>
                </property>
                <property name="singleStep">
                 <double>0.500000000000000</double>