Merge pull request #897 from astroidex/master

new help texts for operators

resources/function_help/AND

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+<h3>AND logical operator</h3>
+Returns 1 when condition a and b are true.
+
+<h4>Syntax</h4>
+<pre> condition a AND condition b </pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 4 = 2+2 AND 1 = 1  &rarr; returns 1 </pre>
+<pre> 4 = 2+2 AND 1 = 2  &rarr; returns 0 </pre>
+

resources/function_help/ILIKE

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+<h3>LIKE expression</h3>
+Returns 1 if the first parameter matches case-insensitive the supplied pattern. ILIKE can be used instead of LIKE to make the match case-insensitive. Works with numbers also.
+
+<h4>Syntax</h4>
+<pre>string/number LIKE pattern</pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 'A' ILIKE 'A'  &rarr; returns 1 </pre>
+<pre> 'A' ILIKE 'a'  &rarr; returns 1 </pre>
+<pre> 'A' ILIKE 'B'  &rarr; returns 0 </pre>

resources/function_help/IS

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+<h3>IS expression</h3>
+Returns 1 if a is the same as b.
+
+<h4>Syntax</h4>
+<pre>a is b</pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 'A' IS 'A'  &rarr; returns 1 </pre>
+<pre> 'A' IS 'a'  &rarr; returns 0 </pre>
+<pre> 4 IS 4      &rarr; returns 1 </pre>
+<pre> 4 IS 2+2    &rarr; returns 1 </pre>
+<pre> 4 IS 2      &rarr; returns 0 </pre>
+<pre> 4 IS 2      &rarr; returns 0 </pre>
+<pre> $geometry IS NULL  &rarr; returns 0, if your geometry is not NULL</pre>
+

resources/function_help/LIKE

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+<h3>LIKE expression</h3>
+Returns 1 if the first parameter matches the supplied pattern. Works with numbers also.
+
+<h4>Syntax</h4>
+<pre>string/number LIKE pattern</pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 'A' LIKE 'A'  &rarr; returns 1 </pre>
+<pre> 'A' LIKE 'a'  &rarr; returns 0 </pre>
+<pre> 'A' LIKE 'B'  &rarr; returns 0 </pre>

resources/function_help/NOT

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+<h3>NOT</h3>
+Returns 1 if a is not the same as b.
+
+<h4>Syntax</h4>
+<pre> a NOT b </pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 'a' IS NOT 'b'  &rarr; returns 1 </pre>
+<pre> 'a' IS NOT 'a'  &rarr; returns 0 </pre>
+<pre> 4 IS NOT 2+2    &rarr; returns 0 </pre>
+

resources/function_help/OR

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+<h3>OR logical operator</h3>
+Returns 1 when condition a or b is true.
+
+<h4>Syntax</h4>
+<pre> condition a OR condition b </pre>
+
+<h4>Arguments</h4>
+None
+
+<h4>Example</h4>
+<pre> 4 = 2+2 OR 1 = 1  &rarr; returns 1 </pre>
+<pre> 4 = 2+2 OR 1 = 2  &rarr; returns 1 </pre>
+<pre> 4 = 2   OR 1 = 2  &rarr; returns 0 </pre>