Clean and document some example/linux (#176)

* Clean arguments.c

* Increase query timeout from 30 to 120 seconds

* Example documentation updated

* Add ibranch comments

* crackme.py, ibranch, sindex and typos

* indexhell

* visitad typo

* typo

* strncmp example

* Typos

examples/linux/basic.c

@@ -1,11 +1,36 @@
-/* Minimal toy example with input/output using libc
- * Symbolic values are read from stdin using standard libc calls. 
- *    
+/**
+ * Symbolic values are read from stdin using standard libc calls.
+ * Program checks if a binary packed integer at the input is 0x41 or less.
+ *
  * Compile with :
- *   $ gcc toy002-libc.c -o toy002-libc
- *     
- * Analize it with:
- *   $ python system.py --sym stdin examples/toy002-libc
+ *   $ gcc -static -Os basic.c -o basic
+ *
+ * Analyze it with:
+ *   $ manticore basic
+ *
+ *   - By default manticore will consider all input of stdin symbolic
+ *
+ * Expected output:
+ *  $ manticore basic
+ *  2017-04-22 10:35:52,789: [9309] MAIN:INFO: Loading program: ['basic']
+ *  2017-04-22 10:35:52,792: [9309] MAIN:INFO: Workspace: ./mcore_IJ2sPb
+ *  2017-04-22 10:36:24,386: [9359][3] EXECUTOR:INFO: Generating testcase No. 1 for state No.3 - Program finished correctly
+ *  2017-04-22 10:36:28,452: [9359][5] EXECUTOR:INFO: Generating testcase No. 2 for state No.5 - Program finished correctly
+ *
+ *  Look at ./mcore_IJ2sPb for results, you will find something like this:
+ *   $ hexdump -C test_00000001.stdin 
+ *   00000000  00 80 00 20                                       |... |
+ *
+ *   $ hexdump -C test_00000002.stdin 
+ *   00000000  41 00 00 00                                       |A...|
+ * 
+ *  You can try out the values like this:
+ *
+ *   $ printf "\x00\x80\x00\x20" | ./basic 
+ *    Message: It is greater than 0x41
+ *
+ *   $ printf "\x41\x00\x00\x00" | ../basic 
+ *    Message: It is smaller or equal than 0x41
 */
 
 #include <stdio.h>