Fix typos: 'neccesary' should be 'necessary'.

git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@581 4cde692c-a291-49d1-8350-778aa11640f8

Doc/documentation.html

@@ -24,7 +24,7 @@ The TTX application works can be used in two ways, depending on what platform yo
 </ul>
 
 <P>
-TTX detects what kind of files it is fed: it will output a .ttx file when it sees a .ttf or .otf, and it will compile a .ttf or .otf when the input file is a .ttx file. By default, the output file is created in the same folder as the input file, and will have the same name as the input file but with a different extension. TTX will <I>never</I> overwrite existing files, but if neccesary will append a unique number to the output filename (before the extension), eg.: "Arial#1.ttf".
+TTX detects what kind of files it is fed: it will output a .ttx file when it sees a .ttf or .otf, and it will compile a .ttf or .otf when the input file is a .ttx file. By default, the output file is created in the same folder as the input file, and will have the same name as the input file but with a different extension. TTX will <I>never</I> overwrite existing files, but if necessary will append a unique number to the output filename (before the extension), eg.: "Arial#1.ttf".
 
 <P>
 When using TTX from the command line there are a bunch of extra options, these are explained in the help text, as displayed when typing "ttx -h" at the command prompt. These additional options include:

Doc/ttx.1

@@ -55,7 +55,7 @@ By default, every output file is created in the same directory as the
 corresponding input file and with the same name except for the
 extension, which is substituted appropriately.
 .Nm
-never overwrites existing files; if neccesary, it appends a suffix to
+never overwrites existing files; if necessary, it appends a suffix to
 the output file name before the extension, as in
 .Pa Arial#1.ttf .
 .Ss "General options"

Lib/fontTools/fondLib.py

@@ -396,7 +396,7 @@ class FontFamily:
 	
 	def _updatestylemappingtable(self):
 		# Update the glyphTableOffset field.
-		# This is neccesary since we have to build this table to 
+		# This is necessary since we have to build this table to 
 		# know what the glyphTableOffset will be.
 		# And we don't want to build it twice, do we?
 		data = self._rawstylemappingtable

Lib/fontTools/ttLib/__init__.py

@@ -64,7 +64,7 @@ class TTFont:
 	
 	"""The main font object. It manages file input and output, and offers
 	a convenient way of accessing tables. 
-	Tables will be only decompiled when neccesary, ie. when they're actually
+	Tables will be only decompiled when necessary, ie. when they're actually
 	accessed. This means that simple operations can be extremely fast.
 	"""