[Coding style] Fix style issues introduced by pull request #127

- Fix indention
- Put braces on function definitions into a new line
- Fix upper and lower cases in doxygen comments
- Break lines at 80 chars
- Delete unnecessary braces
Improve doxygen comments
Fix macros for version output

- Authors in alphabetic order
- Free Software Foundation doesn't hold the copyright
[Coding style] delete unnecessary braces
[Coding style] rename variable
[Coding sytle] delete whitespaces
Fix GPL boilerplate
Fix GPL boilerplate
Improve doxygen comments
Improve doxygen comments
[Coding style] Use braces in 'else' part of the conditional statement
[Coding sytle] delete whitespaces
Improve doxygen comments
Use ifdef to prevent that header will be included twice
Include config.h
[Coding style] delete empty lines
Improve doxygen comments
[Coding sytle] fix indention
Fix compiliation issue on FreeBSD

src/fg_pcap.c: In function 'fg_pcap_work':
src/fg_pcap.c:295: error: label at end of compound statement
*** [src/flowgrindd-fg_pcap.o] Error code 1

The label should point to a statement. C mandates this:

(C99, 6.8.1 Labeled statements p4) " Any statement may be preceded by a
prefix that declares an identifier as a label name."
Unified parsing using macro "PARSE_ERR"