/**
* The strategy trades EURUSD accordingly with several technical
indicators.
* The indicators are the Relative Strength Index, the Stochastic
Oscillator, the Williams Percentage Range and the Commodity Channel
Index.
* The orders are opened within a 30 minutes timeframe. It allows only
a single order placed at the market each time.
* An entry signal is created, either to sell or to buy, when all the
indicators have to point it out. If there's a failure in each one the
entry signal is not acquired.
* The single order standard amount is 5 million. There are no
increases/decreases matched in the script if the equity moves up/down
respectively.
* The script checks the calendar in order to allow order submission;
order's allowance occurs during the week's trading days, except on
Friday after 16h00 GMT.
* Calendar's features avoids carrying orders throught the weekend and
also prevents conditional closures triggered by the leverage decrease
on Friday's.
*/