MIDEAST STOCKS-Qatar outperforms again in sluggish region

* Qatar bullish after technical breakout * Qatar Islamic Bank surges on Q2 earnings * Saudi's Ma'aden sinks on earnings * Emaar Properties outperforms in Dubai * Dollar shortage weighs on Egypt By Andrew Torchia DUBAI, July 19 (Reuters) - Qatar's stock market rose on Tuesday after breaking major technical resistance, but other markets in the region were sluggish, held back by soft oil prices and mixed corporate earnings. The Qatari index climbed 0.6 percent to 10,649 points in a broad-based rise