toc_md: addition of TOC in Markdown files

Author: jvdp1

src/stdlib_experimental_io.md

@@ -2,10 +2,28 @@
 
 ## Implemented
 
- * `loadtxt`
- * `open`
- * `savetxt`
-
+<!-- vim-markdown-toc GFM -->
+
+* [`loadtxt` - load a 2D array from a text file](#loadtxt---load-a-2d-array-from-a-text-file)
+	* [Description](#description)
+	* [Syntax](#syntax)
+	* [Arguments](#arguments)
+	* [Return value](#return-value)
+	* [Example](#example)
+* [`open` - open a file](#open---open-a-file)
+	* [Description](#description-1)
+	* [Syntax](#syntax-1)
+	* [Arguments](#arguments-1)
+	* [Return value](#return-value-1)
+	* [Example](#example-1)
+* [`savetxt` - save a 2D array into a text file](#savetxt---save-a-2d-array-into-a-text-file)
+	* [Description](#description-2)
+	* [Syntax](#syntax-2)
+	* [Arguments](#arguments-2)
+	* [Output](#output)
+	* [Example](#example-2)
+
+<!-- vim-markdown-toc -->
 
 ## `loadtxt` - load a 2D array from a text file
 

src/stdlib_experimental_optval.md

@@ -2,7 +2,17 @@
 
 ## Implemented
 
-* `optval`
+
+<!-- vim-markdown-toc GFM -->
+
+* [`optval` - fallback value for optional arguments](#optval---fallback-value-for-optional-arguments)
+	* [Description](#description)
+	* [Syntax](#syntax)
+	* [Arguments](#arguments)
+	* [Return value](#return-value)
+	* [Example](#example)
+
+<!-- vim-markdown-toc -->
 
 ## `optval` - fallback value for optional arguments
 

src/stdlib_experimental_quadrature.md

@@ -2,8 +2,30 @@
 
 ## Implemented
 
-* `trapz`
-* `trapz_weights`
+<!-- vim-markdown-toc GFM -->
+
+	* [`trapz` - integrate sampled values using trapezoidal rule](#trapz---integrate-sampled-values-using-trapezoidal-rule)
+		* [Syntax](#syntax)
+		* [Arguments](#arguments)
+		* [Return value](#return-value)
+		* [Example](#example)
+	* [`trapz_weights` - trapezoidal rule weights for given abscissas](#trapz_weights---trapezoidal-rule-weights-for-given-abscissas)
+		* [Syntax](#syntax-1)
+		* [Arguments](#arguments-1)
+		* [Return value](#return-value-1)
+		* [Example](#example-1)
+* [`simps` - integrate sampled values using Simpson's rule (to be implemented)](#simps---integrate-sampled-values-using-simpsons-rule-to-be-implemented)
+		* [Syntax](#syntax-2)
+		* [Arguments](#arguments-2)
+		* [Return value](#return-value-2)
+		* [Example](#example-2)
+* [`simps_weights` - Simpson's rule weights for given abscissas (to be implemented)](#simps_weights---simpsons-rule-weights-for-given-abscissas-to-be-implemented)
+		* [Syntax](#syntax-3)
+		* [Arguments](#arguments-3)
+		* [Return value](#return-value-3)
+		* [Example](#example-3)
+
+<!-- vim-markdown-toc -->
 
 ## `trapz` - integrate sampled values using trapezoidal rule
 
@@ -78,7 +100,7 @@ end program
 
 ```
 
-# `simps` - integrate sampled values using Simpson's rule
+# `simps` - integrate sampled values using Simpson's rule (to be implemented)
 
 Returns the Simpson's rule integral of an array `y` representing discrete samples of a function. The integral is computed assuming either equidistant abscissas with spacing `dx` or arbitary abscissas `x`. 
 
@@ -112,7 +134,7 @@ If the size of `y` is two, the result is the same as if `trapz` had been called
 
 TBD
 
-# `simps_weights` - Simpson's rule weights for given abscissas
+# `simps_weights` - Simpson's rule weights for given abscissas (to be implemented)
 
 Given an array of abscissas `x`, computes the array of weights `w` such that if `y` represented function values tabulated at `x`, then `sum(w*y)` produces a Simpson's rule approximation to the integral.