Restructure files

common/code/Code.hs

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+module Code where
+
+data WeekDay = Monday
+             | Tuesday
+             | Thursday
+             | Wednsday
+             | Friday
+             | Saturday
+             | Sunday
+  deriving (Show)
+
+
+f :: Int -> Int -> Int
+f x 0 = 1
+f x y = x * f x (y - 1)
+
+mod2 :: Int -> Int
+mod2 x
+  | x - 2 == 0 = 0
+  | x - 2 < 0  = x
+  | otherwise  = mod2 (x - 2)
+
+week :: [WeekDay]
+week = [Monday, Tuesday, Thursday, Wednsday
+       , Friday, Saturday, Sunday]
+
+isMonday :: WeekDay -> Bool
+isMonday Monday = True
+isMonday x      = False
+
+data Tree = Leaf Char
+          | Node Tree Int Tree
+  deriving Show
+
+data MaybeInt = NoError Int
+              | Error String
+
+calcSomething :: Int -> MaybeInt
+calcSomething x
+  | x < 100   = NoError (x * 5)
+  | otherwise = Error "Int out of range!"
+
+
+f' :: Int -> Int
+f' x = let y p = x + p
+       in x + (y 2)
+
+addTwo :: [Int] -> [Int]
+addTwo [] = []
+addTwo (x:xs) = (x + 2) : addTwo xs
+
+f'' :: String -> Bool
+f'' xs = even . length . (\x -> x ++ "Hello world") $ xs

common/content/VL_links.tex

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+\begin{itemize}
+\item the most popular haskell course from Brent Yorgey:\\ \url{https://www.seas.upenn.edu/~cis194/fall14/spring13/lectures.html}
+\item very verbose and enthusiastic haskell book, good for reading once:\\ \url{http://learnyouahaskell.com}
+\item collection of websites teaching haskell:\\ \url{https://github.com/bitemyapp/learnhaskell}
+\item haskell programming tips (and wiki):\\ \url{https://wiki.haskell.org/Haskell_programming_tips}
+\item the standard module (similar to libc in C):\\ \url{https://hackage.haskell.org/package/base-4.7.0.0/docs/Prelude.html}
+\item debugging in haskell:\\ \url{https://wiki.haskell.org/Debugging}
+\end{itemize}

common/content/VL_sources.tex

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+\begin{itemize}
+\item much content was borrowed or is based on the haskell course from Brent Yorgey:\\ \url{https://www.seas.upenn.edu/~cis194/fall14/spring13/lectures.html}
+\item a few small pieces from the LYAH book \url{http://learnyouahaskell.com}
+\item general information from wikipedia: \\ \url{https://en.wikipedia.org}
+\item general information from haskell wiki: \\ \url{https://wiki.haskell.org}
+\end{itemize}