Cleanup and refactoring of the STM32w port

This is a general cleanup of things like code style issues and code structure of the STM32w port to make it more like the rest of Contiki is structured.

cpu/stm32w108/e_stdio/src/small-dtoa.c

@@ -56,7 +56,7 @@
 #endif
 
 #include <string.h>
-#include "small_mprec.h"
+#include "small-mprec.h"
 
 static int
 _DEFUN (quorem,
@@ -203,8 +203,8 @@ _DEFUN (quorem,
  */
  
  
- /* Scanf and printf call both the small_mprec.c file if small_printf 
-  * has not been specfied optimizations concerning small_mprec.c and
+ /* Scanf and printf call both the small-mprec.c file if small_printf 
+  * has not been specfied optimizations concerning small-mprec.c and
   * call of balloc will be performed anyway for printf. 
   */
  
@@ -292,8 +292,8 @@ _DEFUN (_dtoa_r,
   	*  provided by Balloc variables are initialized to the beginning of the array.
   	*	- For some variables many buffers have been declared, in fact for each call of small_lshift we used a 
   	*  buffer that has not been used at the moment 
-   *  - This buffers are used in the call of function declared in small_mprec.h 
-   *  To have more informations look at small_mprec.c 
+   *  - This buffers are used in the call of function declared in small-mprec.h 
+   *  To have more informations look at small-mprec.c 
    */
   
 _Bigint tab_b[BUF_LSHIFT_SIZE],tab_b1[BUF_SIZE],tab_delta[BUF_SIZE],tab_mlo[BUF_SIZE],tab_mhi[BUF_LSHIFT_SIZE],tab_S[BUF_LSHIFT_SIZE];

cpu/stm32w108/e_stdio/src/small-mprec.c

@@ -86,7 +86,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <reent.h>
-#include "small_mprec.h"
+#include "small-mprec.h"
 
 /* reent.c knows this value */
 #define _Kmax 15

cpu/stm32w108/e_stdio/src/small-strtod.c

@@ -98,8 +98,8 @@ Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
  */
 
 
-/* Scanf and printf call both the small_mprec.c file if small_scanf 
-  * has not been specfied optimizations concerning small_mprec.c and
+/* Scanf and printf call both the small-mprec.c file if small_scanf 
+  * has not been specfied optimizations concerning small-mprec.c and
   * call of balloc will be performed anyway for scanf. 
   */
  
@@ -113,7 +113,7 @@ Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
 #include <_ansi.h>
 #include <reent.h>
 #include <string.h>
-#include "small_mprec.h"
+#include "small-mprec.h"
 
 double
 _DEFUN (_strtod_r, (ptr, s00, se),
@@ -141,8 +141,8 @@ _DEFUN (_strtod_r, (ptr, s00, se),
   	*  provided by Balloc variables are initialized to the beginning of the array.
   	*	- For some variables many buffers have been declared, in fact for each call of small_lshift we used a 
   	*  buffer that has not been used at the moment 
-   *  - This buffers are used in the call of function declared in small_mprec.h 
-   *  To have more informations look at small_mprec.c 
+   *  - This buffers are used in the call of function declared in small-mprec.h 
+   *  To have more informations look at small-mprec.c 
    */
   
   

cpu/stm32w108/e_stdio/src/sp-snprintf.c

@@ -14,8 +14,8 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
-/* doc in _SP_sprintf.c */
-/* This code created by modifying _SP_sprintf.c so copyright inherited. */
+/* doc in sp-sprintf.c */
+/* This code created by modifying sp-sprintf.c so copyright inherited. */
 
 #include <stdio.h>
 #ifdef _HAVE_STDC