DB: source formatting, readme and general cleanup

- Fixed version comments in both .sql files.
- Source formatting in .sql files (using tabs now)
- Added readme with simple and quick install instructions.
- v3.sql -> oracle.sql
- dump_tab_data -> export_oracle_to_postgres.pl (fixed reference to table_order)
- poradiTabulek -> table_order
DB: source formatting, updated readme

- Added some comments and source formatting for export script.
- Updated readme file.
DB: fixed readme
Updated main readme file, added readme for services

- Updated content of main README.md.
- Added basic readme file for perun-services.
DB: support for passing parameters to export scripts

- Added support for parameter passing for export scripts
- Added export_oracle_to_oracle.pl
- Added table_order_base file for creating an user-empty DB instance
- Updated readme
GUI: do not display re-captcha on mail validation

- Skip re-captcha if ?m=[code]&i=[code] are passed in URL (mail validation).
- Fixed menu display on mail validation.
- Added more space in verification failed message.
Merge pull request #407 from zlamalp/captcha

GUI: do not display re-captcha on mail validation
RPC-LIB: Change to prevent NullPointerException

when polling for AuditMessages from RPC (on RPC re-deployment)
LDAPC: fixed error message

- When processing of some AuditMessage fails, pass message ID
  to exception text in logs, not message itself.
Merge pull request #408 from zlamalp/rpclib

RPC-LIB: Change to prevent NullPointerException
GUI: fixed displaying of application form
Merge pull request #409 from zlamalp/registrar

GUI: fixed displaying of application form
Merge pull request #403 from zlamalp/cleanup

DB: cleanup of DB related files and scripts, updated readmes
GUI: fixed link for Perun Web after logout.
Merge pull request #410 from zlamalp/gui

GUI: fixed link for Perun Web after logout.
New service k5login_generic

- new service k5login_generic (gen, send, slave)
- new attribute module k5loginTargetUser for k5login_generic service
- new method log_msg_without_exit

---------NEED TO BE DONE AFTER MERGE--------------
1] create new attribute resource_def_k5loginTargetUser
2] add rights for attribute k5loginTargetUser
3] create service k5loginTargetUser
4] add required attributes to this service
k5login_generic uses normal krb principals

k5login_generic uses normal kerberos principals instead of admin ones