UPDATE 3-Saudis to keep spending heavily in 2015 budget, shrug off oil plunge Thu Dec 25, 2014 10:14am EST * Figures suggest Saudis could cope with years of cheap oil * State spending to edge up 0.6 pct from 2014 plan * Big economic development projects to continue * Budget slashes revenue projection by 16 pct * $39 bln deficit to be covered by fiscal reserves (Adds comments by finance minister, stock market reaction) By Andrew Torchia DUBAI, Dec 25 (Reuters) - Saudi Arabia will lift state spending to a record in its 2015 budget while covering a deficit with...